Join Date: Oct 2012
Location: Clarence, NY- Buffalo suburbs
All they do is tap into all the factory sensors so you can actually see the values that are normally hidden. So their accuracy depends on exactly what your looking at and if it's an actual reading or just an estimated value from what is known. All you'd be able to see to help with fuel is if you monitor the manifold pressure which when negative you'll always get better fuel economy. What do you want to do with the car that you'd be looking to get one?
2009 Cobalt LS XFE (F23) Victory Red
YYZ V.3 Springs, Koni shocks/struts, Powell XXX rear swaybar, Brembo brake swap, 5 lug conversion, Ion Redline wheels, SS/SC interior swap including power conversion, K&N intake, Trifecta tune, Ark Performance N-II catback, Ark shorty antenna, SS body kit, Powell F23 rotated mount, LNF rear mount, Powell CABs
Soon to come- EFR 6758 turbo kit and make Retro Headlights.